1/2" Wide with alternating Austrian crystals and pyramid studs. Our sizing system is like this: XXSmall will fit a neck size from 6"-8" XSmall fits neck size from 8"-10" Small fits neck size from 10"-12" Medium fits neck size from 12"-14" Large fits neck size from 14"-16" XLarge fits neck size from 16"-18" *Please note these items are made to order and require a 2-3 week lead time. 3/8" wide x 4' long leash is also available. Sold separately.